Photonic crystal devices using negative refraction

a technology of negative refraction and crystal devices, which is applied in the direction of lenses, instruments, optical elements, etc., can solve the problems of restricting the application of this type of material and high loss expected
US7808716B2Inactive Publication Date: 2010-10-05NORTHEASTERN UNIV
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2010-10-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

Negative refraction in photonic crystals and diffraction grating is used to design plano-concave lenses to focus plane waves. Microwave experiments are carried out to demonstrate negative refraction and the performance of these lenses. Demonstration of negative refraction of visible light is also performed for the grism. These lenses can be used in optical circuits, astronomical applications, etc.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application No. 60 / 681,521, filed on May 16, 2005, the disclosure of which is incorporated by reference herein.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0002] This invention was made under Air Force Research Laboratories, Hanscom AFB, Contract No. F33615-01-1-1007 and NSF Grant No. PHY-0457002. The government has certain rights in this invention.BACKGROUND OF THE INVENTION

[0003] Two types of materials can exhibit negative refraction and thus possess negative refractive indices. One is the wire and split-ring resonator metamaterial. The other is the photonic crystal.

[0004] A metamaterial has a crystal structure which has a lattice spacing much less than the operating wave length. The mechanism is to invoke electric and magnetic resonances so that this artificial structure can have negative permittivity and permeability simultaneously. ...

Claims

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